character
chebyshev ripple	db (<0.0)
qfactor (resonator)	(>0.0)
frequency	Alpha Low Alpha Up or samplerate: Hz Lower corner Hz Midi note (69=A440) Upper corner Hz Midi note (69=A440)
more	matched z-transform (better off, check frequency response) prewarp (better on)
output	Signal bits (including sign): -1 bit saturation save brutal shift, this will remove shifts up to 4 positions by changing the factor, hence reducing accuracy by maximum 4 bits but more efficient calculation
execution


//Low pass chebyshev filter order=5 alpha1=0.008 
class  FilterChLp5
{
	public:
		FilterChLp5()
		{
			for(int i=0; i <= 5; i++)
				v[i]=0.0;
		}
	private:
		float v[6];
	public:
		float step(float x) //class II 
		{
			v[0] = v[1];
			v[1] = v[2];
			v[2] = v[3];
			v[3] = v[4];
			v[4] = v[5];
			v[5] = (1.742542325711138111e-9 * x)
				 + (0.94276828478459528959 * v[0])
				 + (-4.76640045268403511614 * v[1])
				 + (9.64243479499467781579 * v[2])
				 + (-9.75673679003922345032 * v[3])
				 + (4.93793410718263103831 * v[4]);
			return 
				 (v[0] + v[5])
				+5 * (v[1] + v[4])
				+10 * (v[2] + v[3]);
		}
};